OLED Side Pixels with Oblique Grooves for Bent Display Luminance
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Solution Overview
Problem
Flexible OLED displays experience significant luminance deterioration when bent, with maximum luminance only achievable at a viewing angle of 0 degrees, resulting in poor visibility at the bending display part.
Innovation Solution
The OLED display design includes a front display part, a side display part, and a bending display part, with side pixels featuring an oblique inclination groove and organic emission layer, allowing for maximum luminance at various viewing angles from 5° to 70°, ensuring consistent image visibility across the display.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the OLED display is bent to create a side display part, then the display area is increased and dead space is eliminated, but the luminance is sharply deteriorated at the bending display part
Solution Approach 1:
The patent applies local quality by configuring OLEDs at the side display part and bending display part with a specific inclination angle (θ) relative to the normal direction of the substrate, while front display part OLEDs remain perpendicular. This localized structural differentiation optimizes light emission direction for each region, maintaining high luminance at bent areas while preserving the expanded display area.
Solution Approach 2:
The patent changes the orientation parameter of OLEDs from the conventional perpendicular-to-substrate configuration to an inclined configuration at side and bending display parts. By adjusting the inclination angle parameter, the light emission direction is optimized to compensate for the bending effect, thereby maintaining luminance intensity without sacrificing display area.
2Illumination intensity
If the OLED display is configured for maximum luminance at viewing angle of 0 degrees, then the front display part achieves optimal brightness, but the side display part visibility is poor
Solution Approach 1:
The patent implements local quality by differentiating OLED orientation between front display parts (perpendicular to substrate) and side/bending display parts (inclined at angle θ). This localized adaptation ensures each region's OLEDs are optimally oriented for their specific viewing direction, achieving both front display luminance and side display visibility simultaneously.
Solution Approach 2:
The patent applies asymmetry by using different OLED inclination angles for different display regions. Front display OLEDs are oriented at 0 degrees while side display OLEDs are oriented at an inclined angle θ, creating an asymmetric configuration that optimizes visibility for each viewing position rather than using a uniform orientation.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration maintains high luminance and image visibility at the side and bending display parts, eliminating dead spaces and enhancing user experience by providing optimal viewing angles across the flexible OLED display.
Implementation Method 1
Electrons injected from one electrode and holes is injected from the other electrode are combined in the organic light emitting member to form excitons, and light is emitted as the excitons release energy.
Data Source
AI summary
An organic light emitting diode display may include a front display part including a plurality of front pixels formed on a substrate and realizing an image at a front and a side display part. A side pixel of the side display part may include: a plurality of thin film transistors formed on the substrate; a protective layer covering the plurality of thin film transistor and having an inclination groove that is oblique; a first electrode formed at the inclination groove of the protective layer; a pixel defining layer having an opening exposing the first electrode and formed on the protective layer; an organic emission layer formed on the first electrode and the pixel defining layer; and a second electrode covering the organic emission layer.